Derivatives of 5-cinnamoyl benzofuran

ABSTRACT

Compounds of the formula   IN WHICH   IS DIMETHYLAMINO, DIETHYLAMINO, DIISOPROPYLAMINO, PYRROLIDINO, PIPERIDINO, MORPHOLINO OR PERHYDROAZEPINO; N IS 2 OR 3; AND R3, R4 and R5, which can be the same or different, each is H, alkoxy having 1 to 4 carbon atoms, halogen or hydroxy, or any two or R3, R4 and R5 is methylenedioxy and the other is H. The compounds are prepared by reacting an ether amine of khellinone with an aromatic aldehyde. The compounds possess vasodilatatory, hypotensive, diuretic, spasmolytic, analgesic, antiinflammatory, antihistaminic, antitussive, bronchodilatatory, respiratory analeptic and antiulcerous properties.

United States Patent [191 Fauran et al.

[4 1 Jan. 21, 1975 DERIVATIVES OF S-CINNAMOYL BENZOFURAN [75] Inventors: Claude P. Fauran, Paris; Jeannine A. Eberle, Chatou; Guy M. Raynaud, Paris; Bernard M. Pourrias, Meudon La Foret, all of France [73] Assignee: Delalande S.A., Courbevoie Hauts-de-Seine, Regnault, France [22] Filed: Aug. 23, 1972 [21] Appl. No.: 283,055

[30] Foreign Application Priority Data OTHER PUBLICATIONS CA. 721100, 486t (1970), Fauran et al.

Primary Examiner-Henry R. Jiles Assistant ExaminerS. D. Winters Attorney, Agent, or Firm-Woodhams, Blanchard and Flynn [57] ABSTRACT Compounds of the formula R3 (,JCFIJ I 4 CIHICIIC 0 H \N(CII2)DO/ l O OCH R2 in which is dimethylamino, diethylamino, diisopropylamino, pyrrolidino, piperidino, morpholino or perhydroazepino; n is 2 or 3; and R R and R which can be the same or different, each is H, alkoxy having 1 to 4 carbon atoms, halogen or hydroxy, or any two or R R and R is methylenedioxy and the other is H. The compounds are prepared by reacting an ether amine of khellinone with an aromatic aldehyde. The compounds possess vasodilatatory, hypotensive, diuretic, spasmolytic, analgesic, antiinflammatory, antihistaminic, antitussive, bronchodilatatory, respiratory analeptic and antiulcerous properties.

5 Claims, No Drawings DERIVATIVES OF S-CINNAMOYL BENZOFURAN Derivatives of 5cinnamoyl benzofuran of formula:

OCH:

1 Ar(H=(HCO W ZO- born in which Ar is an unsubstituted or a substituted phenyl radical and Z is a N-tertiary amino alkoxy radical are known.

The present invention relates to derivatives of the same structure which, more precisely, correspond to the formula:

represents a dimethylamino, diethylamino or a diisopropylamino radical, or a pyrrolidino, piperidino, morpholino or perhydroazepine radical;

n is 2 or 3;

R R and R which may be the same or different to one another, each represent a hydrogen atom, an alkoxy radical containing l to 4 carbon atoms,

a halogen atom or a hydroxy radical, or two of the radicals R R and R can form a methylenedioxy bridge, in which case the remaining radical represents a hydrogen atom. The compounds of formula (I) are obtained by reacting in an alkaline medium, a suitable ether amine of khellinone of formula:

in which formulas R,, R R R and R have the same signification as in formula (I).

The method ofoperation applied comprises combining the compounds of formula (II) and (III) in an alcoholic solution, to which there is added, drop by drop, a solution of soda and maintaining the temperature of the reaction mixture at 20C. The product obtained is recovered after approximately 4% hours of contact at ambient temperature with agitation, by diluting said reaction mixture with water and extracting with ether.

Except when one of the radicals R R and R is a hydroxy radical. it is also possible to add the compounds of formula (ll) and (Ill), without solvent, to a solution of sodium in methanol, leaving the mixture in contact for approximately 4 hours with agitation, and recovering the product obtained by dilution with water, separating the precipitate formed by filtration, redissolving in ether, washing with water and recrystallisation from 5 isopropyl ether.

In the majority of cases, the second method of operation leads to an increased yield of final product.

The compounds of formula (I), obtained by one or other of the above-described methods, may subsel quently be converted into their acid-addition salts.

The following preparations are given by way ofexample to illustrate both methods of operation.

EXAMPLE 1 -Cinnamoyl-4,7-dimethoxy-6-piperidinoethoxybenzofuran (Code No. 7163) 140 ml of 50% soda is added, drop by drop, to a solution containing 0.15 mol of 5-acetyl-4,7-dimethoxy-6- piperidinoethoxy benzofuran and 0.14 mol of benzaldehyde in 400 ml of ethanol whilst maintaining the temperature of the reaction mixture at C. The mixture is left in contact, with agitation, for 4 /2 hours and then the reaction mixture is poured into 1 litre of water. One extracts with ether, washes with water, dries over sodium sulfate, evaporates the solvent and recrystallises the residue from isopropyl ether.

Melting point 75 Yield 75% Empirical formula C H NO Elementary analysis: C H N Calculated 71.70 6.71 3.22 Found 71.71 6.69 3.28

EXAMPLE 2 5-p-Chlorocinnamoyl-6dimethylaminoethoxy-4,7- dimethoxybenzofuran oxalate (Code No. 70413) 0.4 mol of 5-acetyl-6-dimethylaminoethoxy-4,7- dimethoxybenzofuran and 0.4 mol of p-chlorobenzaldehyde (without solvent) are added to a solution of 4g. of sodium in 400 ml of anhydrous methanol. The mixture is left in contact with agitation for 4 hours and is thereafter diluted with 1.5 litres of water. The precipitate which is an oil, crystallises. The resultant product is filtered and the precipitate which separates is dissolved in 500 ml of ether. The solution obtained is washed 3 times with 200 ml of water. After evaporation, the product obtained is recrystallised from 250 ml of isopropyl ether to give 5-(p-chlorocinnamoyl)-6- dimethylaminoethoxy-4,7-dimethoxybenzofuran.

Melting point 83C Yield 70% Empirical formula C H ClNO Elementary analysis: N

C H 64.26 5.63 64.ll 5.60

Calculated Found '70 ing oxalate is obtained.

Empirical formula C H Cl N 0 Elementary analysis:

C H N Calculated 57.75 5.04 2.69 Found 57.62 5.15 2.79

The compounds listed in the following Table have been prepared according to the invention.

The compounds of formula (1) have been studied on animals in the laboratory and have been shown to possess vasodilatatory hypotensive, diuretic, spasmolytic,

1. Vasodilatatory properties These properties can be shown in three ways.

a. Administered by intra arterial means in doses which do not modify the arterial pressure, the compounds of formula (1) provoke an augmentation of the flow in the femoral artery, the point where the injection was effected, in an anesthetised dog with an anastomosis between carotid and femoral artery, the flow being measured by a rotameter inserted at the level of derivatron.

In a dose of 25 ug/kg/Il, compound No. 70313 augmented the femoral flow by 50%.

b. The compounds of formula (1) are capable of augmenting the flow of the coronary vessels of the isolated heart of a guinea-pig, when said compounds are added in the perfusion liquid of said organ.

By way of examples, the results obtained with different compounds of formula (1) are listed in the following Table 11:

TABLE 11 Code No. of Concentration introduced Percentage increase compound into the perfusion in the flow of the tested liquid (pg/ml) isolated heart of a guinea-pig c. Finally, the compounds of formula (I) possess the property of inhibiting the contracture of the depolarised isolated artery of the rabbit.

This contracture is lowered by 75% with a dose of 200 ug of compound No. 70319.

2. Hypotcnsive properties Administered by intraveinous means on the anaesthetised rat or cat, the compounds of formula (I) provoke a lowering of the arterial pressure.

The results obtained with a certain number of compounds are given in the following Table 111:

3. Diuretic properties The compounds of formula (1), administered by oral means to the mouse or rat, simultaneously with an isotonic solution of sodium chloride (1 ml per 25g. of the corporeal weight of the mouse and 2.5 ml per 100g. of

Code No. of

the corporeal weight of the rat) are capable of provoking an augmentation of the volume of urine emitted by reference to control animals, the volume being measured for 4 hours following administration.

The results obtained with certain of the compounds are given in the following Table IV.

TABLE IV Code No. Dose of compound administ- Animal Increase of the tested ered diuresis 7163 20 mg/kg/PO mouse 45 7t 7173 50 mg/kg/PO rat 131) "/7 70425 50 mg/kg/PO rat 190 71250 20 mg/kg/PO mouse 50 71 70313 50 mg/kg/PO rat 120 A 70314 50 mgIkg/PO mouse 65 70319 50 mg/kg/PO rat 71 71240 20 mg/kg/PO mouse 40 /r 72227 25 mglkg/PO rat 70 71 72177 25 mg/kg/PO rat (10 C4 4. Spasmolytic properties The compounds of formula (1), introduced in the conserving medium, are capable of opposing the contractural action of barium chloride on the isolated duodenum of the rat.

This activity is evaluated by taking papaverine as standard.

The results obtained with several of the compounds are listed inthe following Table V.

TABLE V.

Code No. of compound tested Spasmolytic activity 7163 10 X paporverine 70426 2 X do. 71162 1 X do. 69178 0.5 X do. 71130 3 X do. 71280 2.5 X do. 71240 3 X do. 71103 3 X do. 71250 1 X do. 71100 1 X do. 72136 4 X do. 72181 4 X do. 72180 2 X do. 72144 3 X do. 72202 2.5 X do. 72177 1 X do. 72211 1 X do.

5. Analgesic properties The compounds of formula (1), administered by oral means on the mouse are capable of reducing the number of painful stretchings produced by the intraperitoneal injection of acetic acid.

The results obtained with different compounds of formula (1) are specified in the following Table V1v TABLE VI Dose Percentage of reduction compound administered of the number of tested (mglkg/PO) painful stretchings (72) TABLE VI-Continued TABLE VIII Code No. of Dose Percentage of reduction Code No. of 7 Dose Increase of the compound administered of the number of compound administered respirator) frequency tested (mg/kg/PO) painful stretchings (70) tested 71162 33 75 71162 0.5 mg/kg/LV. so /1 69178 5 mg/kg/LV. 40 "/1 H100 100 55 71103 2 mg/kg/LV. 45 l1 1 l. Antiulcerous ro erties 6. Antunflammatory properties p p The compounds of formula (1), administered by ing gi fgggi gz ggs i gs zz T ig gzg gig: traduodenal means, reduce the extent of gastric ulcers p y p y 3 provoked in a rat by tying of the pylorus (Shay ulcers).

tion of a phlogogenic agent, such ascarraghenine, to a rat following oral administration of the compounds of formula (I).

The results obtained with several of the compounds are listed in the following Table VII:

TABLE VII Code No. of Dose Reduction of the compound tested administered oedema 69178 100 mg/kg/PO 40 71250 50 mglkg/PO 45 72227 200 mg/kg/PO 45 72233 200 mg/kg/PO 50 7. Antihistaminic properties The compounds of formula (I), introduced in the conserving medium, are capable of opposing the contractural action of histamine on the isolated ileum of a guinea-pig. This activity is evaluated by taking promethazine as standard.

By way of example, the activity of compound No. 71240 is equivalent to a third that of promethazine.

8 Antitussive properties The compounds of formula (I), administered by intraveinous means, reduce the coughing provoked by stimulation of the upper laryngeal nerve in the anaesthetised cat.

In a dose of 1 mg/kg/I.V., compound No. 71130 reduces the coughing provoked by 80% for a period of 15 minutes.

9. Bronchodilatatory properties 10. Respiratory analeptic properties The compounds of formula (I), administered by intraveinous means to an anaesthetised guinea-pig are capable of opposing the respiratory depression provoked by morphine.

The results obtained with certain of the compounds are given in the following Table VIII.

By way of examples, the results given in the following Table IX are obtained by the intraduodenal administration of 50 mg/kg of different compounds of formula (I):

TABLE IX Code No. of compound tested 72136 72144 72202 Percentage reduction of 40 40 50 Shay ulcers As can be seen from the results expressed above and those shown in the following Table X, the difference between the lethal dose and the pharmacologically active dose is sufficiently great to permit the compounds of formula (I) to be used in therapeutics.

The compounds of formula (I) are useful in the treatment of circulatory insufficiencies, hypertensions, oedemas, diverse spasms, diverse originating pains, allergies, coughs, asthma and respiratory depressions.

They may be administered by oral means in the form of tablets, degrees and gelules containing 20 to 250 mg of active ingredient (1 to 5 times a day) and in the form of drinkable liquids in doses of 0.1 to 2% (20 drops, 3 times a day) by rectal means in the form of suppositories containing 20 to mg. of active ingredient (l or 2 times a day) and by parenteral means in the form of injcctable ampoules containing to 150 mg. of active H. ingredient (l or 2 times a day). 4. A compound of the formula Accordingly, the present invention relates to a therapeutic composition comprising a compound of the general formula (I) together with a therapeutically 5 moo 00m acceptable carrier. l

What we claim is: 1r3oo@on=orrool. A compound of the formula 11300 mo 0 R4 00: N (CIIQ)ZO l zit. n m 1 CJI=(JII-UO 3 R or a pharmacologically acceptable acid addition salt \N-(CU) 0 thereof. 1 2 n 0011, 5. A compound of the formula OCH;

in which 0@CH=c1r-oo 1I2JJO R1\ \O/ N-tcrmn-o N 0cm is dimethylamino, diethylamino, diisopropylamino, in which pyrrolidino, piperidino, morpholino or perhydroazepino; n is 2 or 3; and R R and R are H, alkoxy having 1 to 4 carbon atoms, halogen or hydroxy, with the proviso that at R:

least one of R R and R is hydroxy; or a pharmocologically acceptable acid addition salt is dimethylamino, diethylamino, diisopropylamino, thereof. pyrrolidino, piperidino, morpholino or perhy- 2. A compound according to claim 1, in which one droazepino; and of R R and R is OH, another one thereof is OCH n is 2 or 3; and the third one thereof is H. or a pharmacologically acceptable acid addition salt 3. A compound according to claim 1, in which one thereof. of R R and R is OH, and the other two thereof are 

1. A COMPOUND OF THE FORMULA
 2. A compound according to claim 1, in which one of R3, R4 and R5 is OH, another one thereof is -OCH3 and the third one thereof is H.
 3. A compound according to claim 1, in which one of R3, R4 and R5 is OH, and the other two thereof are H.
 4. A compound of the formula
 5. A compound of the formula 